/**
 * Copyright 2009-2019 the original author or authors.
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.ibatis.type;

import java.io.InputStream;
import java.sql.*;

/**
 * The {@link TypeHandler} for {@link Blob}/{@link InputStream} using method supported at JDBC 4.0.
 * @since 3.4.0
 * @author Kazuki Shimizu
 */
public class BlobInputStreamTypeHandler extends BaseTypeHandler<InputStream> {

	/**
	 * Set an {@link InputStream} into {@link PreparedStatement}.
	 * @see PreparedStatement#setBlob(int, InputStream)
	 */
	@Override
	public void setNonNullParameter(PreparedStatement ps, int i, InputStream parameter, JdbcType jdbcType)
			throws SQLException {
		ps.setBlob(i, parameter);
	}

	/**
	 * Get an {@link InputStream} that corresponds to a specified column name from {@link ResultSet}.
	 * @see ResultSet#getBlob(String)
	 */
	@Override
	public InputStream getNullableResult(ResultSet rs, String columnName)
			throws SQLException {
		return toInputStream(rs.getBlob(columnName));
	}

	/**
	 * Get an {@link InputStream} that corresponds to a specified column index from {@link ResultSet}.
	 * @see ResultSet#getBlob(int)
	 */
	@Override
	public InputStream getNullableResult(ResultSet rs, int columnIndex)
			throws SQLException {
		return toInputStream(rs.getBlob(columnIndex));
	}

	/**
	 * Get an {@link InputStream} that corresponds to a specified column index from {@link CallableStatement}.
	 * @see CallableStatement#getBlob(int)
	 */
	@Override
	public InputStream getNullableResult(CallableStatement cs, int columnIndex)
			throws SQLException {
		return toInputStream(cs.getBlob(columnIndex));
	}

	private InputStream toInputStream(Blob blob) throws SQLException {
		if (blob == null) {
			return null;
		} else {
			return blob.getBinaryStream();
		}
	}

}
